Time for a new system

Hi, I thought it was time to upgrade my computer again, not only a new gpu, but about everything, 'cept for RAM(8GB DDR3), CD-ROM and HDD(Although, in addition to the 500GB, I added a 1TB to it as well!)

Now, the thing that initally had me confused, was the CPU, as I was not too sure about the 2600k module and the other i7 structures, but that's the one I ended up picking... Also, I'm a tad bit confused considering the SLI and soundcard matter; as the soundcard uses 1 PCI-e spot, and I have two NVIDA GPU's, would it still have a rather satisfactory result, or would I have to pick a new MOBO with support of additional PCI-e? No idea if it uses x16 or whatever it is.

Here's the list of upgrades:

Intel® Core™ i7-2600K Processor Socket-LGA1155, Quad Core, 3.4Ghz, 8MB, 95W, Boxed w/fan
Creative X-FI Titanium Fatal1ty Champion PCI Express x1, lydkort
Gigabyte GeForce GTX 580 1536MB PhysX PCI-Express 2.0, GDDR5, 2xDVI, HDMI, Windforce 3X, 795MHz (x2)
MSI P67A-GD65 B3, Socket-1155 ATX, P67, DDR3, 2xPCIe(2.0)x16, SLI/CFX, SATA 6Gb/s, USB3.0, eSATA, FW, THX, EFI
Samsung SpinPoint F3 1TB 7200RPM, SATA 3.0 Gbps, 3,5", 32MB Cache, 8.9ms
Corsair HX 1050W PSU ATX 12V V2.2, 80 Plus Silver, Modular, 6x 6+2-pin PCIe, 12x SATA, 140mm Vifte

Note: Vifte = Fan, lydkort = sound-card.

Now for the misc specs:

Windows 7, OEM
Logitech G35 Gaming headset 7.1 surround sound powered by dolby
Cooler Master HAF 922 Midi Tower Sort Vifter: 1x 200mm Front, 1x 200mm Topp, 1x 120mm Bak, Rød LEDs, Card Reader
BenQ 24" LCD G2420HD 1920x1080, 40000:1, 2ms, VGA/DVI/HDMI (x3)

If you have any suggestions; or if this build would result in an erroneous scenario, please enlighten me on the matter, thanks  

- Inam